A troy ounce is exactly 31.1034768 grams.
Troy ounces to Stones Converter — oz t to st
Convert Troy ounce (oz t) to Stone (st) using the exact conversion factor (1 troy ounce = 0.0048979592 stone). See the formula, worked examples, conversion table, history, and common uses.
Troy ounces to Stones converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
A stone is 14 pounds.
Result = input x 0.0311034768 / 6.35029318.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Stones
Weight conversions between Troy ounce and Stone come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A troy ounce is exactly 31.1034768 grams, and a stone is 14 pounds.
Formula
stones = troy ounces × 0.00489795918367
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 stone equals 6.35029318 base units, so dividing one by the other gives the direct troy ounce-to-stone factor of 0.00489795918367.
Simple example
1 oz t × 0.004897959184 = 0.0048979592 st
1 troy ounce = 0.0048979592 stones.
Real-world example
50 oz t × 0.004897959184 = 0.2448979592 st
50 troy ounces = 0.2448979592 stones.
Conversion table
| Troy ounce (oz t) | Stone (st) |
|---|---|
| 1 oz t | 0.0048979592 st |
| 5 oz t | 0.0244897959 st |
| 10 oz t | 0.0489795918 st |
| 25 oz t | 0.1224489796 st |
| 50 oz t | 0.2448979592 st |
| 100 oz t | 0.4897959184 st |
Reverse conversion: Stone to Troy ounce
0.0048979592 st × 204.1666667 = 1.000000003 oz t
0.0048979592 stones = 1.000000003 troy ounces.
troy ounces = stones × 204.166666667
For a page dedicated to this direction, see Stone to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Stone
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
Where it's used: United Kingdom and Ireland (body weight)
Uses of the Stone today
- Body weight reporting in the UK and Ireland (e.g. '12 stone 5 pounds')
- Historical wool and agricultural produce weighing
History of the Stone
The stone dates to medieval England as a general-purpose weight unit, historically varying by region and commodity (a 'stone' of wool differed from a 'stone' of meat) before settling on 14 pounds for general use. It remains in everyday use for body weight in the UK and Ireland, unlike most other English customary units which have been replaced or supplemented by metric measures.
Historical origin. Stone was not the invention of a single named person; it developed through the process described above.
Stone — sources
- UK Weights and Measures Act 1985 — Confirms the stone (14 lb) as a legally recognized UK unit for body weight.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many stones are in 1 troy ounce?
1 troy ounce equals 0.0048979592 stones, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to stone?
Multiply the troy ounce value by 0.004897959184. The converter above does this instantly to whatever precision you set.
How do I convert stone back to troy ounce?
Use the reverse factor: 1 stone equals 204.1666667 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
What is a stone?
Stone (st) measures mass. A stone is 14 pounds: exactly 6.35029318 kilograms. It is classified as a UK customary unit.
Is the troy ounce to stone conversion exact?
Yes. A stone is 14 pounds: exactly 6.35029318 kilograms. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.